Modeling and analysis of steady-state torque characteristics for a miniature electromagnetic retarder

An exponential type function has been utilized to model the torque vs. speed characteristics of a miniature electromagnetic retarder. The model is based on the results from a detailed electromagnetic analysis of the eddy current machines with rotor thickness as a design variable. The model parameters are then adjusted for optimal retarding performance. Model of the electromagnetic retarder with an inertia load and adjusted parameters has been used to simulate a series of torque curves with peaks shifting over a range of rotor speeds. The simulation results show that the peaks of the torque curves should be designed to occur within a specific range of speeds for optimal retarding performance.